Ultra Grand Slam Sport Fishing 

4.6/5 (38 reviews)
 
State licensed
 North Roosevelt Boulevard, Key West, FL 33040, United States

Ultra Grand Slam Sport Fishing 

State licensed
Key West, FL, United States
48 ft
6
4.6/5 (38 reviews)

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Ride in comfort aboard one of the largest charter boats at charter boat row!

Ultra Grand Slam Sport Fishing Charters and Captain Magnus Nilsson invite you down to Key West for an adventure of a lifetime. The company specializes in inshore, offshore, wrecks, and reef fishing trips that are great for seasoned enthusiasts and record-seekers alike.

Captain Magnus loves catching fish and having a great time on the water. The first mate will cater to your every need. We customize our trips to maximize your pleasure.

Whether you want to watch your friend reeling in the biggest catch in their life or you wish to test your angling skills and make a great catch possible, there is a trip for you. You will be able to enjoy the view, spot any action going on beneath the surface, and take in all the beauty of the surrounding waters from a flybridge.

Your day out will take you fishing for anything from Mutton Snapper and Kingfish to Black Grouper, Barracuda, Amberjack, Sharks, and Marlin. You will be trolling and live bait fishing for all big game species. Even if the weather doesn't cooperate, Capt. Magnus and his crew will take you to the sheltered waters, where you will be able to try your hand at Jacks, Shark, and Barracuda.

The 'Ultra Grand Slam' is a Concord AMF Brunswick with 47' of excellence. She has been uphauled in 2018 and comes powered by a pair of 450 HP Cummins engines. The Ultra Grand Slam is rigged with latest electronics, technologies, and professional accessories.

All trips come with the use of high-quality Penn International and Shimano tackle, as well as lures. Live bait will be caught on the trip.

Ride in comfort aboard one of the largest charter boats at charter boat row!

Ultra Grand Slam Sport Fishing Charters and Captain Magnus Nilsson invite you down to Key West for an adventure of a lifetime. The company specializes in inshore, offshore, wrecks, and reef fishing trips that are great for seasoned enthusiasts and record-seekers alike.

Captain Magnus loves catching fish and having a great time on the water. The first mate will cater to your every need. We customize our trips to maximize your pleasure.

Whether you want to watch your friend reeling in the biggest catch in their life or you wish to test your angling skills and make a great catch possible, there is a trip for you. You will be able to enjoy the view, spot any action going on beneath the surface, and take in all the beauty of the surrounding waters from a flybridge.

Your day out will take you fishing for anything from Mutton Snapper and Kingfish to Black Grouper, Barracuda, Amberjack, Sharks, and Marlin. You will be trolling and live bait fishing for all big game species. Even if the weather doesn't cooperate, Capt. Magnus and his crew will take you to the sheltered waters, where you will be able to try your hand at Jacks, Shark, and Barracuda.

The 'Ultra Grand Slam' is a Concord AMF Brunswick with 47' of excellence. She has been uphauled in 2018 and comes powered by a pair of 450 HP Cummins engines. The Ultra Grand Slam is rigged with latest electronics, technologies, and professional accessories.

All trips come with the use of high-quality Penn International and Shimano tackle, as well as lures. Live bait will be caught on the trip.

Magnus Nilsson
Captain
Magnus Nilsson
18 years of experience
ID & credentials verified
responds within an hour

Trip availability and prices

Trip Date:
Group Size:
Select date to see availability
August 2026
SuMoTuWeThFrSa
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Number of days
1
Group Size
2 adults • 0 children
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Half Day Deep Sea Sportfishing
FREE Cancellation 3 days notice
4 hour trip starts at 8:00 AM
Dolphin (Mahi Mahi)
Marlin (Blue)
Marlin (White)
Sailfish
+4
US $950
Entire boat: up to 6 people
3/4 Day – Deep Sea Sportfishing
FREE Cancellation 3 days notice
6 hour trip starts at 8:00 AM
Cobia
Dolphin (Mahi Mahi)
Grouper (Gag)
Shark (Hammerhead)
+8
US $1,200
Entire boat: up to 6 people
Full Day – Deep Sea Sportfishing
FREE Cancellation 3 days notice
8 hour trip starts at 8:00 AM
Dolphin (Mahi Mahi)
Grouper (Goliath)
Marlin (Blue)
Marlin (White)
+8
US $1,500
Entire boat: up to 6 people
There are 2 people looking at this charter.

Customer reviews

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Rating

4.6
38 reviews
4.4
Boat & equipment
4.8
Captain & crew
4.7
Fishing Experience

Anglers' gallery (31)

What anglers say

82%
Recommended
80%
Caught fish

All reviews (38)

Frequently mentioned
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Showing 15 of 38 reviews
Patrick Clark
Patrick Clark
us
Kansas, US
Member since 2025
5.0
Verified
Excellent Experience
Half Day Deep Sea Sportfishing on March 20, 20263 adults

Unbelievable experience. The guys worked hard to catch great fish. Snagged barracuda and king fish. Took fillets downtown to local restaurants for catch and cook that were unreal.

Aaron Pitterman
Aaron Pitterman
Repeat angler
us
California, US
Member since 2020
4 trips
5.0
Verified
Great crew!
3/4 Day – Deep Sea Sportfishing on February 21, 20263 adults

We had a great trip. Amazing crew.

Reported catch:
Dolphin (Mahi Mahi)
Magnus Nilsson
Response from Captain

Thank you Aaron, looking forward to next time.

Russell Mcallister
Russell Mcallister
Repeat angler
us
Missouri, US
Member since 2025
2 trips
4.3
Verified
New
July fishing trip
3/4 Day – Deep Sea Sportfishing on July 27, 20265 adults

Reported catch:
Dolphin (Mahi Mahi)
Chris Brigham
Chris Brigham
us
Massachusetts, US
Member since 2025
The captain canceled
December 30, 2025
Trip was supposed to happen on December 30, 2025

The charter operator canceled 1 days prior to the trip date. This is an automated posting.

Michael  McDorman
Michael McDorman
us
Indiana, US
Member since 2022
5.0
Verified
Full day trip
Full Day – Deep Sea Sportfishing on August 10, 20224 adults

We had a great time and caught a lot of Dolphin. The captain and first mate were awsome . If you want the best boat and crew this is it no need to look any further.

Magnus Nilsson
Response from Captain

Thank you Michael, it was indeed great fishing with you guys

FAQs about Ultra Grand Slam Sport Fishing

Ultra Grand Slam Sport Fishing offers the following trips to customers:
  • US $950 per group - Half Day Deep Sea Sportfishing (4 hours)
  • US $1,200 per group - 3/4 Day – Deep Sea Sportfishing (6 hours)
  • US $1,500 per group - Full Day – Deep Sea Sportfishing (8 hours)
When you book a trip with Ultra Grand Slam Sport Fishing, you can expect the following amenities onboard:
  • Toilet Full Size, Stand-up, Electric, lady-friendly
  • Air conditioning
  • Fighting chair
  • GPS
  • Fishfinder
  • Bed
  • Flybridge
  • Live bait well
  • Kitchen
  • Refrigerator
  • Multimedia system
  • Outriggers
  • Ice box
Trips booked with Ultra Grand Slam Sport Fishing include:
  • Rods, reels & tackle
  • Live bait (Caught during the trip)
  • Lures
  • Catch cleaning & filleting (Cleaning fish included in the price of the trip)
  • First mate (20%)
  • Fishing license (Of fishing licenses included in the trip price)
Ultra Grand Slam Sport Fishing offers the following types of fishing:
  • Inshore fishing
  • Offshore fishing (Up to 30 miles)
  • Reef fishing
  • Wreck fishing
Ultra Grand Slam Sport Fishing offers the following fishing techniques:
  • Light tackle
  • Heavy tackle
  • Bottom fishing
  • Trolling
  • Spinning
  • Jigging
  • Deep sea fishing
Top targeted fish species with Ultra Grand Slam Sport Fishing include:
  • Amberjack
  • Barracuda (Great)
  • Dolphin (Mahi Mahi)
  • Grouper (Black)
  • King Mackerel (Kingfish)
  • Marlin (Blue)
  • Marlin (White)
  • Sailfish
  • Shark (Blacktip)
  • Shark (Hammerhead)
  • Shark (Tiger)
  • Snapper (Mutton)

Your captain

Magnus Nilsson
Magnus Nilsson
Magnus Nilsson

Key West, Florida, United States

2 Fishing Reports
ID & license verified
38 Customer reviews
Typical response within an hour
Member since February 2018

Ride in comfort aboard the largest charter boat at historic charter boat row! Captain Magnus is born to fish and knows the Key West waters like the back of his hand. MEET THE CREW: Captain Magnus is the Owner/Operator of THE ULTRA GRAND SLAM FIVE (((5))) STAR SPORT FISHING CHARTERS! Known as 'The Key West Fishing Viking' Capt. Magnus catches the Big Ones running out of the World Famous Charter Boat Row. THE ULTRA GRAND SLAM is a Fully Equipped, Deep Sea, Sports Fishing Cruiser and, is one of the few with Air Conditioning!!! His First Mate, Ross has been making it happen for over 20 years and has caught 3,600 Billfish to date!!! Together with Captain Magnus, they are the hardest working crew in Key West. Be there when they make it #3,601!!!

2 Fishing Reports
ID & license verified
38 Customer reviews
Typical response within an hour
Member since February 2018

Ride in comfort aboard the largest charter boat at historic charter boat row! Captain Magnus is born to fish and knows the Key West waters like the back of his hand. MEET THE CREW: Captain Magnus is the Owner/Operator of THE ULTRA GRAND SLAM FIVE (((5))) STAR SPORT FISHING CHARTERS! Known as 'The Key West Fishing Viking' Capt. Magnus catches the Big Ones running out of the World Famous Charter Boat Row. THE ULTRA GRAND SLAM is a Fully Equipped, Deep Sea, Sports Fishing Cruiser and, is one of the few with Air Conditioning!!! His First Mate, Ross has been making it happen for over 20 years and has caught 3,600 Billfish to date!!! Together with Captain Magnus, they are the hardest working crew in Key West. Be there when they make it #3,601!!!

The fish you can target

Amberjack
Amberjack
Great Barracuda
Great Barracuda
Dolphin (Mahi Mahi)
Dolphin (Mahi Mahi)
Black Grouper
Black Grouper
King Mackerel (Kingfish)
King Mackerel (Kingfish)
Blue Marlin
Blue Marlin
White Marlin
White Marlin
Sailfish
Sailfish
Blacktip Shark
Blacktip Shark
Hammerhead Shark
Hammerhead Shark
Tiger Shark
Tiger Shark
Mutton Snapper
Mutton Snapper
Amberjack
Amberjack
Great Barracuda
Great Barracuda
Dolphin (Mahi Mahi)
Dolphin (Mahi Mahi)
Black Grouper
Black Grouper
King Mackerel (Kingfish)
King Mackerel (Kingfish)

What is the boat like?

Boat image
Boat category
Sportfishing boats
Capacity
6 persons
Boat length
48 ft
Year built
1977
Restored in
2018
Boat manufacturer
Concord AMF Brunswick
Boat type
Sportfishing
Engine model
Cummins
Powered by
2 x 450HP
Max cruising speed
22 knots

What kind of fishing will you do?

Inshore Fishing
Offshore Fishing
Up to 30 miles
Reef Fishing
Wreck Fishing

Which fishing techniques you can try

Light Tackle
Heavy Tackle
Bottom Fishing
Trolling
Spinning
Jigging
Deep Sea Fishing

Which amenities are available onboard

Toilet
Full Size, Stand-up, Electric, lady-friendly
Air conditioning
Fighting chair
GPS
Fishfinder
Bed
Flybridge
Live bait well
Kitchen
Refrigerator
Multimedia system
Outriggers
Ice box

What's included in the trip price

Rods, reels & tackle
Live bait
Caught during the trip
Lures
Catch cleaning & filleting
Cleaning fish included in the price of the trip
First mate
20%
Fishing license
Of fishing licenses included in the trip price

How cancellations work

Free cancellation up to 3 days prior to trip

You can cancel or modify your booking up to 3 days before the trip date, free of charge. If you cancel or modify your booking later, or fail to show up, you'll forfeit 100% of what you've paid.

More details

What the listing policies are

Pickup not included

Transfer to/from departure site is not included in trip rates.

Child friendly
Infants allowed, no min age; life vests supplied
You keep catch
Catch and release allowed
Disabled accessible

How you can pay

Book with 20% deposit, pay rest to captain

When the captain confirms your trip, FishingBooker charges your credit card a 20% deposit to guarantee your reservation.

The remaining balance is to be paid directly to the charter operator on or prior to your trip date in one of the following payment methods:

 Cash

 Visa

 Mastercard

 American Express

When paying the remaining balance with a credit card, an additional 3% charge will apply.

What’s biting in Key West right now

AmberjackAmberjack
Barracuda (Great)Barracuda (Great)
Dolphin (Mahi Mahi)Dolphin (Mahi Mahi)
Grouper (Black)Grouper (Black)
King Mackerel (Kingfish)King Mackerel (Kingfish)
Marlin (Blue)Marlin (Blue)
SailfishSailfish
Shark (Blacktip)Shark (Blacktip)
Snapper (Mutton)Snapper (Mutton)

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Ultra Grand Slam Sport Fishing
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48 ft
Group size 1 - 6
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Fish 1
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+10
4 hour trip • 6 persons
US $950